NPPB and hydrops fetalis: Among the examined single indicators, the AUC of age (AUCAge 0.734, 95% CI 0.619–0.877), BNP (AUCBNP 0.686, 95% CI 0.524–0.848), and CONUT score (AUCCONUT score 0.841, 95% CI 0.790–0.890) revealed that these factors could significantly predict all-cause death in systolic HF patients after 90 days follow-up.